Thank you all for trying to help
after I really given up I do some other search and now it works flawlessly
I have 3 images now
openatv 7.3 on slot one
gemini 4.2 on slot 2
melin on slot 3
I succeeded after doing some search and I found a project called after earth so I followed it and found that AIO will solve the problem
I installed Gemini AIO and used these commands
echo "deb [trusted=yes]
https://repo.fury.io/aio/ ./" > /etc/apt/sources.list.d/aio.list
apt-get update
apt-get upgrade
after that I used the script sent by Captain who I am so grateful to his time and help
now I will try to have the sd card works as an extra slots
I wish you also can give a hand and tell me how to do it.